Screen



July' 6, 1937.

Illllllll lIVIIILmI Matr/2go.

July 6, 1937.

L. G. SYMONS SCREEN 3 Sheets-Sheet 2 Filed June l2, 1935 July 6,` 1937. G A'sYMoNs i 2,085,774

SCREEN Filed'June 12, 1935 v: sheets-Sheet 5 iiiininl [Patentes July s, 1937' UNITED IsrATEs PAT-'ENT OFFICE SCREEN of Wisconsin Application June 12,

17 Claims.

My invention relates to an improvement in screens or material separating devices and has for one purpose the provision of a screen which shall be economical to manufacture, easy to op- 5 crate, durable and highly eillcient in operation. Another object is the provision of improved means for. supporting a vibratory screen deck. Another object is the provision of improved means for supporting the vibrating means of a vibrating l screen. Another object is the provision of improved means for limiting and controlling the vibrating means of a vibrating screen.

. objects will appear from time to time in the course of the specication and claims.

I I illustrate my invention more or less diagrammatically in the laccompanying drawings, wherem Figure 1 is a partial plan view of my invention;

Figure 2kis a side elevation with parts broken away and parts in section;

Figure 3 is an enlarged section taken onl the line 3-3 of Figure 2;

vFigure 4 is a section taken on the line 4-4 of g5 Figure 3; and

Figure 5Is a section taken on the line 5-5 of Figure 3.

. Like parts are indicated by like symbols throughout the speciication and drawings.

Referring to the drawings, I generally indicates any suitable base which may, for example, be formed by generally parallel side members indicated as 2. Any suitable transverse supports or connections indicated as 3 may be employed.

5 generally indicates any suitable screen deck. The deck is not indicated in great.detail as a variety of screen decks may be employed. As means for mounting the screen deck 5 upon the base or support I, I provide a plurality of upwardly inclined springs generally indicated as 6.

I illustrate each spring 6 as composed of a plurality of laminations 6a, clamped for example by clamps 8b, intermediate their ends. These laminations are preferably not over 11g" in thickness andthe clamps 6b are indicated illustratively rather than as limiting me to the particular spring disposition shown. The springs 6 are associated with and are bolted to angles 1 and 8 which may be welded or otherwise secured to the support I and the screen deck 5 respectively.

8 indicates any suitable bolts with nuts I0 which engage suitable spring clamp plates II. The

ilanges Ila of the angles 1 and 8 serve as spacers 55 between the adjacent pairs of springs 8.

Other 1935 Serial N0. 26,233

I5 indicates any suitable screen cloth but the yattachment of the cloth to the deck 5 is not shown in `detail as it does not of itself form part of the present invention. It will be understood that lI may employ screen cloth or any other suitable l vperforated or apertured screening member or surface, secured tothe deck 5 in any suitable manner.

In order to hold the springs 6 to a predetermined neutral position I provide additional yielding means at either side intermediate the support I and the screen deck 5. I illustrate, for example, fa bracket 20 on the deck 5 and a corresponding bracket Z'I on the support I. Passing through the aperture 22 of the bracket 20 is the reduced end of the pin or guide 23. It is locked in position in relation to the bracket 26, as by any suitable nut 24. The opposite end of the pin 23 passes through the aperture 25 of 'the bracket 2i yPositioned about the pin 23 on opposite sides of the bracket 2| are coil springs 26, 21, which are compressed between the washers 28, 29, and the nuts 30, 3|. The effect of this yielding connection between the deck 5 and the support I is to constrain the kdeck to a predetermined neutral position, which is preferably the position shown in Figure 2 with the springs 6 unfiexed. However, the springs 26, 21, have such strength as to permit vibratory movement of the deck 5 in response to the rotation of the vibrating means below described. The compression of the springs may be adjusted, by tightening or loosening the nuts 30 or 3l.

In order to impart Vibration to .the deck 5 I lmay employ an unbalanced member.

trate, however, a particular type of unbalanced member which I find highly advantageous and` In reference to the particular unbalanced member herein shown and claimed, I illustrate a bearing sleeve generally indicated as 35 which is provided at opposite sides with flat webs 36 to which may be bolted springs 31, 33 respectively, on opposite sides of the axis of rotation of` the rotor. These springs, formed of thin laminae, may be bolted in position as by the employment of clamping plates 39, bolts 40 and nuts 4I. The opposite ends are clamped between any suitable brackets 42, clamp plates 43, bolts 44, and nuts 45. It will be observed from Figure 1 that the springs 31 and 38 are generally parallel and that I illuszgi they are both secured in relation to the screen deck itself.

I nd it preferable, although not absolutely necessary, to have the springs 31 and 38 generally perpendicular to the deck supporting springs 6. For additional supporting means for the vibratory structure, whereby the springs 31, 38

are held normally in then'e/utral position in winch they are shown in Figure 2, I provide at both 1o bearing sleeves 35 a pin 50 secured to the lower r web 36. It passes through the apertured bracket 5| on the screen deck and is provided with coil springs 52, 53, located on opposite sides of said bracket and held under compression as by washers 54, 55, and adjustable nuts 56, 51. The structure just described serves as an additional supporting means for holding the vibrating mechanism in the position in which it is shown in Figure 1, while still permitting its exure in response to the rotation of the below described unbalanced member.

The rotor itself includes the shaft 60 provided with any suitable pulley 6| about which may pass the belt 62 to any suitable motor or power source 63. 64 indicates an inner ball raceabout the shaft 60 and 65 an outer ball race within the member 35. 66 indicates any suitable balls or rollers whereby the shaft 60 is permitted to rotate freely with a minimum of friction within the sleeve 35. 61 is one member of any suitable dust excluding labyrinth or seal and 68 the opposite member. It will be understood that the member 61 rotates with the shaft 60, whereas 68 is fixed in relation to or forms part of the member 35. It will be realized that any other suitable means for excluding dust or confining lubricant may be employed. 69 is an inner end plate associated with the end member 18 to which the cylindrical housing portion 1| may be secured in any suitable manner, for example, by welding. The result is a tightly closed housing with no'room for access of dust. It will be understood that `whereas I have described but one end of the vibrating mechanism, both ends may be identically formed.

Rotating with and as a part of the'shaft 60 is the square central portion 15 which extends substantially throughout the length of the housing 1|. l' Secured to it is a shorter xed member 16, herein shown as spaced centrally of the square central portion and having outwardly extending shoulders 11 which may be apertured as aty 18 to permit the passage therethrough of limit bolts 19 the length of which may be ad- 55 justed as by nuts 80, fitting in pockets 8| in the outer face of the member 16. The bolts 19 are provided with limit heads 82. 83 indicates compression springs surrounding the bolts 19 and compressed between the heads 82 and the bottom surface 84 of pockets or apertures'85 formed inside members 88. The side members 86, of which two are shown, are connected to the cross members 81 and 88. It will be understood that the members 86, 81 and 88 may be integral or secured together by the pins 90 with heads 9| and adjustable nuts 92 so that they move as a unit. The side members 86 and the cross member 81 extend substantially throughout the length of the housing 1|, whereas the smaller cross members 88 may be secured at either end of the members 86, as illustrated in Figures 1 and 3. The cross members 88 are preferably spaced from the members 86 by spacing bars 89 of predetermined thickness, which determine the clearance 89a between the square shaft 15 and the 'cross bars 88. It will be understood that the strength of the springs 83 is such that when the rotor is at rest the parts are normally in the position in which they are shown in Figures 4 and 5. When the motor i driving the rotor through the pulleys 6| and hen a predetermined speed cf `rotation is reached, then the centrifugal tendency of the member 81, with its attached members 86, overcomes the force of the springs 83 and moves outwardly from the 10 center of rotation of the shaft 60. 'Ihe parts are so proportioned that when the springs 83 hold the parts in the position of Figure 5 the rotor is in dynamic balance and will rotate without causing any vibration. `When the speed l5 increases suflciently to cause the members 86, 81, 88 and 89 to move centrifugally outwardlyv from the axis of rotation of the rotor, the member then becomes unbalanced, and, in response to its rotation, vibrates and causes a vibration 20 of all attached parts including the screen deck 5. The clearance 89a obtained by the spacing members 89, limits the distance the members 86,

81 can move outwardly from the axis of the rotor 15. 25

'Ihe rate of rotation necessary to cause this unbalance may be determined, controlled and adjusted by setting the nuts in order to increase or diminish the compression on the springs 83. 30

It will be understood that the spacing members 89 may be replaced by similar spacing members of more or less thickness in order to vary the clearance 89a. which defines' the possible movement of the member 81, away from 35 the center of rotation of the shaft 60 and away from the opposite xed member 16. Thus I can, by setting the springs 83, limit or control the speed of rotation necessary to cause unbalance, and by varying the thickness of the 40 spacing members 89 I can limit the possible maximum unbalance permitted.

It will be realized that whereas I have described and shown a practical and operative, device, nevertheless many changes might be 45 made in thesize, shape, number and disposition of parts without departing from the spirit of my invention. I therefore wish my description and showing to be taken as in a broad sense illustrative and diagrammatic rather than as limit- 50 ing me to my specific showing.

'I'he use and operation of my invention are as follows:

I find it desirable to mount my rotor upon leaf springs as they forrn a very advantageous 55 connection between the rotor and the screen deck. When the device is out of use, however, it is important to provide additional supporting-,means, to prevent undesired exure of the springs 31, 38. I find the pin or pins 50 in con- 60 nection with the springs 52 and 53 an adequate solution of this problem. It has the further advantage of providing a further limit and control of the amplitude of vibration of the springs `31, 38, in response to rotation of the` rotor, par- 65 ticularly at low speeds when the device is being stopped. y

I nd it preferable to have the springs 31, 38, perpendicular to the springs 6 but this is not absolutely necessary and -I wish my claims to 70 be interpreted with suiiicient scope to cover a substantial deflection from such perpendicularity. I further nd it an ecient solution to have the unbalanced rotor positioned above the screen deck and intermediate the ends of the 75 rotating it about a-horizontal a screen deck. This again is to some extent a matter of convenience and gmy screen will operate with the unbalanced rotor positioned beyond the end of the deck.

I claim: 1. In a vibrating screen, a support, a screen deck, yielding supporting means intermediate said support and said deck, including a plurality of parallel leaf spring members positioned at a plurality o f points along the opposite sides of said screen deck, and means for vibrating said deck, including an unbalanced rotor and means f or xi extending transversely across theline of movement of the screen, bearing means for said rotor and a exible supporting connection between said bearing means and the screen deck, including a plurality of leaf spring members secured to opposite sides of said screen deck, said last mentioned spring members being generally perpendicular to the spring supporting members intermediate the deck and the support. e

2. In a vibrating screen, a support, a screen deck,. yielding supporting means intermediate said support and said deck, including a plurality of parallel leaf spring members positioned at a plurality of points along the opposite sides of said screen deck, and means for vibrating said deck, including an unbalanced rotorand means for rotating it about a horizontal axis extending transversely across the line of movement of the screen, bearing means for said rotor and a flexible supporting connection between said bearing means and the screen deck, including a plurality of leaf spring members secured to opposite sides of said screen deck, said last mentioned spring members being generally perpendicular to the spring supporting members intermediate the deck and the support, the leaf spring members between the unbalanced rotor and the screen deck being located some on one side and some on the opposite side of the axis of rotation of said rotor.

3. In a. vibrating screen, a support, a screen deck, yielding supporting means intermediate said support and said deck, including a plurality of parallel leaf spring members positioned at a plurality of points along the opposite sides of said screen deck, and means for vibrating said deck, including an unbalanced rotor and means for rotating it about a horizontal axis extending transversely across the line of movement of the screen, bearing means for said rotor and a exible supporting connection between said bearing means and the screen deck, including a plurality of leaf spring members secured to opposite sides of said screen deck, said last mentioned spring members being generally perpendicular to the spring supporting members intermediate the deck and the support, the leaf spring members between the unbalanced rotor and the screen deck being located some on one side and some on the opposite side of the axis of rotation of said rotor, there being a pair of such members adjacent each side of the screen deck.

4. In a vibrating screen, a support, a screen deck, yielding supporting means intermediate said support and said deck, inc1uding a plurality of parallel leaf spring members positioned at a plurality of points along the opposite sides of said screen deck, and means for vibrating said deck, including an unbalanced rotor and means for rotating it about a horizontal axis extending transversely across the line of movement of the screen, bearing means for said rotor and a flexible supporting connection between said bearing means and the screen deck, including a plurality of leaf spring members secured to opposite sides of said screen deck, said last mentioned spring members 4being generally perpendicular to the spring supporting members intermediate the deck and the support, and being inclined upwardly somewhat from the planeof the deck, the unbalanced roto being located above said deck. f

5. In a vibrating screen, a support, a screen deck, yielding supporting means intermediate /said support and said deck, 'including a plurality of parallel leaf spring members positioned at a plurality of points along the opposite sides oi' said screen deck, and means for vibrating -said deck, including an unbalanced rotor and means for rotating it about a horizontal axis extending transversely across the line of movement of the screen, bearing means for said rotor and a flexible, supporting connection between said bearing means and the screen deck, including a. plurality of leaf springmembers secured to opposite sides of said screen deck, said last mentioned spring members being generally perpendicular to the spring supporting members intermediate the deck and the support, and being inclined upwardly somewhat from the plane of the deck, the unbalanced rotor being located above said deck, and intermediate its ends.

6'. In a vibrating screen, a support, a screenl decir, supporting leaf springs intermediate said support and said deck, a rotary unbalanced member supported on said screen deck, and supporting leaf springs therefor, intermediate said rotary member and said deck, the leaf springs intermediate the housing and the screen deck beinggenerally perpendicular to the leaf springs intermediate the screen deck and the support, and yield-f ing means between the screen deck and the support and between the screen deck and the rotary unbalanced member respectively, tending respectively to move said screen deck into a predetermined neutral position in relation to the support,

and to move said rotar-y unbalanced member into a predetermined position in relation to the screen deck.

7. In a vibrating screen, a support, a screen deck, yielding supporting means intermediate said screen deck and support, a rotary unbalanced member supported on said screen deck, means for rotating it, supporting leaf springs therefor intermediate said rotary member and deck, and' additional yielding supporting means between the rotary member and the screen deck, adapted to permit flexureV of the leaf springs, but tending to move the rotary unbalanced member and leaf springs into a predetermined position in relation to the screen deck.

8. In combination, a flexibly'mounted screen, an unbalanced rotatable member, means for rotating it about a horizontal axis extending transversely across the line of movement of the screen, bearings therefor, anda supporting connection between said bearings and said screen including a plurality of flexible leaf spring connections, said connections rbeing inclined somewhat in relation to thescreen, said unbalanced rotatable member being positioned out of the plane of the screen.

9. In combination, a flexibly mounted screen, an unbalanced rotatable member, means for rotating it about a horizontal axis extending transversely across the line of movement of the screen, bearings therefor, and a supporting connection between said bearings and said screen including a plurality of flexible leaf spring connections, said connections being inclined somewhat in relation to the screen, said unbalanced rotatable member being positioned out of the plane of the screen, and an additional yielding connection between the bearings of said unbalanced member and the screen, eilective to permit ilexure-of said first mentioned flexible leaf spring supporting connections.

10. In combination, a flexibly mounted screen, an unbalanced rotatable member, means for rotating 'it,.bearings therefor, and a. connection between said bearings and said screenincluding a plurality of flexible leaf spring connections, said connections being inclined somewhat in relation to the screen, said unbalanced rotatable member being positioned out of the plane f the screen, and an additional yielding connection between the bearings of said unbalanced member and the screen, effective to permit flexure of said first mentioned flexible leaf spring connections, and including a stem extending intermediate said bearings and screen, and yielding means associated with said stem, tending to move said unbalanced member to a predetermined position in relation to the screen.

11. In a vibrating screen, a support, a screen deck, yielding leaf springs intermediate said support and said screen deck, a rotary unbalanced' member supported on said screen deck, a housing thereabout, and leaf springs, intermediate said housing and said screen deck, the leaf springs intermediate the housing and the screen deck being generally perpendicular to the leaf springs intermediate the screen deck and the support, and means tending to limit the ilexure of the leaf springs supporting said housing.

12. In a vibrating screen, a support, a screen deck oscillatably mounted on said support, and means for vibrating said screen, including an unbalanced rotor mounted for rotation about a horizontal axis extending transversely of the path of movement of the screen, bearing means for said rotor, and a flexible supporting connection between said bearing means and th'e screen deck,

including a plurality of leaf spring members secured to opposite sides of the screen deck in pairs, one leaf spring of each pair being secured to said bearing means above the axis of rotation of the unbalanced member, and one below.

13. In a vibrating screen, a support, a screen deck oscillatably mounted on said support, and means for vibrating said screen, including an unbalanced rotor mounted for rotation about a horizontal axis extending transversely of the path of movement of the screen, bearing means for said rotor, and a liexible supporting connection between said bearing means and the screen deck, including a plurality of leaf spring members secured to opposite sides of the screen deck in pairs, one leaf spring of each pair being secured to said bearing means above thc axis of rotation of the unbalanced member, and one below, and additional yielding means, interposed between the bearing means for the rotor and the screen deck,

for limiting the ilexure of said leaf spring members.

14. In a vibrating screen, a support, a screen deck oscillatably mounted on said support for oscillation in a generally arcuate path, and means for vibrating said screen, including a rotor mounted for rotation about a horizontal axis extending transversely of the path' of movement of the screen, and a flexible supporting connection between said rotor and the screen deck whereby said rotor canoscillate, in relation to said deck, in a generally arcuate path, the tangentsof the path of oscillation of the deck in relation to its support and of the path, of oscillation of the rotor in relation to the deck being substantially perpendicular to each other.

15. In la vibrating screen, a support, a screen deck oscillatably mounted on said support for oscillation in a generally arcuatepath, and means for vibrating said screen, including a rotor mounted for rotation about a horizontal axis extending transversely of the path of movement of the screen, and a flexible supporting connection between said rotor and the screen deck whereby said rotor can oscillate, in relation to said deck,'in a generally arcuate path, the 'tangents of the path of oscillation of the deck in relation to its support and of the path of oscillation of the rotor in relation to the deck being at a substantial angle to each other.

16. In a vibrating screen, a support, a screen deck oscillatably mounted on said support for oscillation in a generally arcuate path, and means for vibrating said screen, including a rotor mounted for rotation about a horizontal axis extending transversely of the path of movement of the screen, and a flexible supporting connection between said rotoi` and the screen deck whereby said rotor can oscillate, in relation to said deck, in a generally arcuate path, the tangents of the path of oscillation of the deck in relation to its support and of the path of oscillation of the rotor in relation to the deck being at a substantial angle to each other, the supporting means for the screen deck, and for the rotor, including leaf springs.

17. In a vibrating screen, a support, a screen deck oscillatably mounted on said support for oscillation in a generally arcuate path, and means for vibrating said screen, including a rotor mounted for rotation about a horizontal axis extending transversely of the path of movement of the screen, and a flexible supporting connection between said rotor and the screen deck whereby said rotor can oscillate, in relation to said deck, in a generally arcuate path, the tangents of the path of oscillation of the deck in relation to its support and of the path of oscillation of the rotor fn relation to the deck being at a substantial angle to each other, the supporting means for the screen deck, and for the rotor, including leaf springs, the supporting springs intermediate the rotor and deck being generally perpendicular to the supporting means intermediate deck and support.

LOREN G. SYMONS. 

